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REVIEWER FOR NEWTON’S FIRST LAW
THIRD LAW
Newton's First Law: A Foundation of Motion
Newton's First Law of Motion, often referred to as the Law of Inertia, is a fundamental
principle in physics that describes the behavior of objects in the absence of external forces.
It states that an object at rest will remain at rest, and an object in motion will continue in
motion with the same speed and in the same direction unless acted upon by an unbalanced
force.
This seemingly simple statement has profound implications for understanding how the
universe works. It forms the basis for understanding concepts like momentum, energy, and
the interaction of objects in various systems
EXAMPLE’S OF NEWTON’S FIRST LAW
🎀 A BOOK ON A TABLE: The book remains at rest because the forces acting on it are
balanced (gravity pulling it down and the table pushing it up).
🎀 A CAR MOVING AT CONSTANT SPEED: The car continues moving at a constant speed
because the forces acting on it are balanced (engine force pushing it forward and friction
resisting its motion).
🎀 A HOCKEY PUCK SLIDING ON ICE: The puck continues to slide at a constant speed
and direction because there is very little friction acting on it.
Significance of Newton's First Law:
Newton's First Law is crucial for understanding the behavior of objects in various
situations. It helps us:
- Predict the motion of objects: By understanding the forces acting on an object, we can
predict its motion.
- Design and build structures: Engineers use Newton's Laws to design structures that can
withstand forces and remain stable.
- Develop new technologies: The principles of motion are essential for developing new
technologies like vehicles, rockets, and other machines.
Overall, Newton's First Law of Motion is a foundational principle in physics that
provides a framework for understanding the behavior of objects in the universe. Its
simplicity and universality make it a powerful tool for explaining and predicting the
motion of objects in various systems.
● NEWTON’S SECOND LAW 🎀
Newton's Second Law: The Key to Understanding Motion
Newton's Second Law of Motion, often referred to as the "Law of Acceleration," is a
fundamental principle in physics that describes the relationship between force, mass,
and acceleration. It states that the acceleration of an object is directly proportional to
the net force acting on it and inversely proportional to its mass. This means that a
larger force will produce a larger acceleration, while a larger mass will result in a
smaller acceleration for the same force.
● Force: A push or pull that can cause a change in an object's motion. It is measured
in Newtons (N).
● Mass: A measure of an object's inertia, or resistance to changes in motion. It is
measured in kilograms (kg).
● Accerelation: The rate of change of an object's velocity. It is measured in meters per
second squared (m/s²).
The Equation:
Newton's Second Law is mathematically expressed as:
F = ma
● - F represents the net force acting on the object
● - m represents the mass of the object
● - a represents the acceleration of the object
EXAMPLES
● - Pushing a Box: If you push a box with a certain force, it will accelerate. The
heavier the box, the smaller the acceleration will be.
● - Throwing a Ball: When you throw a ball, you apply a force to it, causing it to
accelerate. The force you apply determines the speed
and direction of the ball's motion.
NEWTON’S THIRD LAW 🎀
Newton's Third Law: The Law of Action and Reaction
Newton's Third Law of Motion, often referred to as the "Law of Action and Reaction," is a
fundamental principle in physics that describes the nature of forces as interactions between
objects. It states that for every action, there is an equal and opposite reaction. This means
that when one object exerts a force on a second object, the second object exerts an equal
and opposite force on the first object.
● ACTION FORCE:The force exerted by one object on another.
● REACTION FORCE:The equal and opposite force exerted by the second object on
the first.
● EQUAL MAGNITUDE:The action and reaction forces have the same strength.
● OPPOSITE DIRECTION:The action and reaction forces act in opposite directions.
Examples:
🎀 Walking: When you walk, you push your foot against the ground (action force). The
ground pushes back on your foot with an equal and opposite force (reaction force),
propelling you forward.
🎀 Jumping: When you jump, you push down on the ground (action force). The ground
pushes back up on you with an equal and opposite force (reaction force), launching you into
the air.
🎀 Rocket Propulsion: A rocket expels hot gases out of its nozzle (action force). The gases
push back on the rocket with an equal and opposite force (reaction force), propelling the
rocket forward.
IMPORTANT POINTS:
🌊 Action and reaction forces act on different objects: The action force acts on the
second object, while the reaction force acts on the first object.
🌊 Action and reaction forces do not cancel each other out: They do not cancel
because they act on different objects.
🌊 Newton's Third Law applies to all types of forces: It applies to gravitational,
electromagnetic, and strong and weak nuclear forces.
